Perimetry

Perimetry

Perimetry or campimetry is the systematic measurement of differential light sensitivity in the visual field by the detection of the presence of test targets on a defined background. Visual field testing can be performed clinically with confrontational field testing keeping the subject's gaze fixed while presenting objects at various places in their visual field. This is generally used to explore the extreme boundaries of the visual field. Perimetry more carefully maps and quantifies the visual field. Simple manual equipment can be used such as in the tangent screen test or the Amsler grid. When dedicated machinery is used it is called a perimeter. Kinetic perimetry uses a mobile stimulus moved by a perimetrist such as in Goldmann kinetic perimetry. Kinetic perimetry is useful for mapping visual field sensitivity boundaries. Threshold static perimetry is generally done using automated equipment. It is used for rapid screening and follow up of diseases involving deficits such as scotomas, loss of peripheral vision and more subtle vision loss. Perimetry testing is important in the screening, diagnosing, and monitoring of various eye, retinal, optic nerve and brain disorders.

ee also

*Binasal hemianopsia
*Bitemporal hemianopsia
*Blind spot
*Scotoma
*Visual field test

References

* [http://www.ixm.us/ IXMUS Color Field Test] Blue-Yellow and Blue-Red Visual Testing for Macular Degeneration and Optic Nerve Disease
* [http://webeye.ophth.uiowa.edu/ips/Perimetr.htm What is perimetry? International Perimetric Society]
* [http://webeye.ophth.uiowa.edu/ips/GEN-INFO/standards/IPS90.HTM Perimetry standards 1990]
* [http://www.emedicine.com/oph/topic643.htm Neuro-ophthalmologic examination eMedicine]
* [http://www.nlm.nih.gov/medlineplus/ency/article/003879.htm MedlinePlus Medical Encyclopedia: Visual Field]
* [http://www.optometrists.asn.au/ceo/backissues/vol88/no2/4087 Recent developments in perimetry: test stimuli and procedures] AM McKendrick. Clinical and Experimental Optometry 2005; 88:2: 73-80
* [http://www.eyetec.net/group3/M12S1.htm eyetec module on visual field testing]
*Spector, Robert H. 1990. Visual Fields. Clinical Methods The History Physical and Laboratory Examinations 3rd ed, Walker HK, Hall WD, Hurst JW editors. Butterworth. VIII:116;565-572 [http://www.ncbi.nlm.nih.gov/books/bookres.fcgi/cm/ch116pdf.pdf NIH Books]


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Look at other dictionaries:

  • Perimetry — Per*im e*try, n. The art of using the perimeter; measurement of the field of vision. [1913 Webster] …   The Collaborative International Dictionary of English

  • perimetry — [pə rim′ə trē] n. the testing of the scope of vision by means of a perimeter * * * …   Universalium

  • perimetry — [pə rim′ə trē] n. the testing of the scope of vision by means of a perimeter …   English World dictionary

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  • perimetry — noun The systematic measurement of light sensitivity in the visual field by the detection of the presence of test targets on a defined background. Syn: campimetry …   Wiktionary

  • perimetry — 1. The determination of the limits of the visual field. 2. The mapping of the sensitivity contours of the visual field. [G. perimetros, circumference] computed p. determination of the visual field …   Medical dictionary

  • perimetry — n. measuring the outer boundary of a figure or area, measuring the perimeter …   English contemporary dictionary

  • perimetry — pe·rim·e·try …   English syllables

  • perimetry — noun see perimeter I …   Useful english dictionary

  • Meridian (perimetry, visual field) — This article is about the perimetry concept. For other uses of the word, see Meridian. Meridian is used in perimetry and in specifying visual fields. According to IPS Perimetry Standards 1978 (2002): Perimetry is the measurement of [an observer… …   Wikipedia

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